Devil-Linux is a special secure Linux distribution which is used for firewalls, routers, gateways, and servers. The goal of Devil-Linux is to have a small, customizable, and secure Linux system. Configuration is saved on a floppy disk or USB stick, and it has several optional packages. Devil-Linux boots from CD, but can be stored on CF cards or USB sticks.

Care2x (formerly Care 2002) is software
for hospitals and health care organizations. It is
designed to integrate the different information
systems existing in these organizations into a
single efficient system. It solves the problems
inherent in a network of multiple programs that
are incompatible with each other. It can integrate
almost any type of services, systems, departments,
clinics, processes, data, or communication that
exist in a hospital. Its design can even handle
non-medical services or functions like security or
maintenance. All of its functions can be accessed
with a Web browser, and all program modules are
processed on the server side.

SoL-diag is a diskless Linux distribution that was
designed for the rescue and analysis of i686
computers. The 36MB image contains over 300
programs, including DVD and MP3 players and CD-RW
buring tools. It is also useful for improving your
Linux skills and benchmarking computers without
having to install programs to the hard drive.

rpm livelinuxcd is a set of ISO images and a
toolkit. The first CD image is a basic live CD
with X/KDE, GNOME, twm, VPN/DSL, kickstart, and
other tools based on RPM packages. The second CD
image includes a server with ssh, Apache, PHP,
MySQL, Samba, Squid, and more, but without X11.
The toolkit consists of shell scripts to create
new CDs from RPM package lists or comps files.

S-terminal lets you create a secure X terminal. Regular X terminals pass unencrypted data between you the remote machine. S-terminal creates an encrypted tunnel through which all X traffic passes. It replaces the remote xdm login screen with a local application that collects username and password, then sets up an ssh tunnel to the remote host and starts a session. It is highly configurable both in appearance and behavior, and deployed S-terminals can be remotely administered. Best of all, it can be added to a KNOPPIX CD to create an instant, bootable, secure X terminal CD.

PlumpOS is a bootable openMosix node on a CD. Pop the CD into a 486+ computer and you have an instant openMosix node. It supports loading 3rd-party packages and adding custom kernels. It takes up very few resources. It was originally a clone of clump/os, but has evolved into something that doesn't resemble it much anymore.

Rocks is a complete "cluster on a CD" solution for
x86 and IA64 Red Hat Linux COTS clusters. Building
a Rocks cluster does not require any experience in
clustering, yet a cluster architect will find a
flexible and programmatic way to redesign the
entire software stack just below the surface
(appropriately hidden from the majority of users).
Although Rocks includes the tools expected from
any clustering software stack (PBS, Maui, GM
support, Ganglia, etc), it is unique in its
simplicity of installation.